Multiple Imputation using Weighted Quantile Sum Regression

The `miWQS` package handles the uncertainty due to below the detection limit in a correlated component mixture problem. Researchers want to determine if a set/mixture of continuous and correlated components/chemicals is associated with an outcome and if so, which components are important in that mixture. These components share a common outcome but are interval-censored between zero and low thresholds, or detection limits, that may be different across the components. The `miWQS` package applies the multiple imputation (MI) procedure to the weighted quantile sum regression (WQS) methodology for continuous, binary, or count outcomes. The two imputation models coded in `miWQS` package are: bootstrapping imputation (Lubin et.al (2004) ) and Bayesian imputation.